If a customer has a gen8 blade with an Emulex CNA and they are using a 10gb passthru, the only way they can do FCOE is if they are connecting to an upstream switch that is capable of it, like a Nexus 2k/5k?

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Reply from Sunny:

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Correct.

The FCoE function uses DCBX protocol to discover whether the switch port it is connected to is capable and enabled for doing FCoE traffic. If not, the FCoE function doesn't go online.